Method for decolorizing rice bran wax

Abstract

The invention discloses a method for decolorizing rice bran wax. The method comprises the steps of dehydrating rice bran wax paste, adding an industrial hexane solvent for removing oil, then adding an adsorption decolorizing agent for decolorizing in the presence of the industrial hexane solvent, and finally performing solid-liquid separation and evaporation to remove the solvent, thus obtaining decolorized rice bran wax. Compared with the prior art, the method has the advantages that the method does not adopt any oxidant, no heavy metals are left, a large amount of wastewater is not produced, the production cost is reduced, and the pollutants are reduced; and meanwhile, a white rice bran wax product with the whiteness of nearly 32 can be obtained by adopting the method, the purity of the product is high, and the application range of the product is expanded.

Description

Technical field [0001] The invention relates to a decolorization method, in particular to a decolorization method of rice bran wax. Background technique [0002] Rice bran wax is an important by-product of rice oil processing. The main component of rice bran wax is an ester composed of higher fatty alcohols and higher fatty acids. It has a high melting point and precipitates at room temperature. Rice bran wax is obtained from the by-product of rice bran oil refining. Yes, the extracted rice bran wax has its due value in many aspects, such as being widely used in food, daily chemicals, and chemical industries. [0003] The extraction and refining process of rice bran wax is mainly divided into three steps: degumming, deoiling and decoloring. The deoiling and decolorizing process is the most important. The deoiling methods mainly include filter press saponification method and solvent extraction method. The filter press saponification method is based on the unsaponifiable of rice bra...

AI Technical Summary

Problems solved by technology

[0004] For the decolorization method of rice bran wax, the strong oxidant oxidation method is mostly used at present. This method requires a large amount of water washing to remove metal ions, produces a large amount of waste water, and is prone to metal ion pollution at the same time. If the water washing is not thorough, the product purity is not high; existing In the technology, physical adsorbent plant ash is also used for decolorization, but no matter whether it is decolorization by strong oxidant or plant ash, the effect is not ideal, and the color of rice bran wax after decolorization is better can only reach about 25 whiteness, which restricts the product. Application range